Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, PR China; College of Material Science and Engineering, Key Laboratory of Automobile Materials of Ministry of Education, Jilin University, 2699 Qianjin Street, Changchun 130012, PR China.
Key Laboratory of Marine Chemistry Theory and Technology, Ministry of Education, Ocean University of China, Qingdao 266100, PR China.
J Colloid Interface Sci. 2015 Jul 15;450:246-253. doi: 10.1016/j.jcis.2015.03.016. Epub 2015 Mar 20.
Heterostructured Ag3PO4/m-TiO2 (mesoporous sphere) visible-light photocatalyst has been synthesized via a facile method. The resultant composite consists of numerous Ag3PO4 nanoparticles with diameter less than 10nm, and these nanoparticles deposit onto the TiO2 nanoparticles surface forming a heterostructure. N2 adsorption-desorption measurements have suggested that the composite was porous with relative high surface area. Studies of the photocatalytic activity and stability of heterostructured Ag3PO4/m-TiO2 for the degradation of methylene blue (MB) have indicated that its visible light photocatalytic performance was improved compared with pure Ag3PO4 and Ag3PO4/m-TiO2, and exhibited excellent photocatalytic stability. The performance was improved attributing to three aspects: (1) the large specific surface area enhanced the adsorption of MB; (2) numerous pores enlarged the contact area between photocatalyst and MB; (3) the most importantly, depositing Ag3PO4 onto the surface of TiO2 facilitated the separation of electron and hole pairs, which also elevates the photocatalytic performance. Furthermore, the photocatalytic mechanism also has been discussed. Compare with Ag3PO4, the Ag weight percent of Ag3PO4/m-TiO2 decreases from 77% to 20.8%, significantly reducing the cost of photocatalyst.
具有介孔结构的 Ag3PO4/m-TiO2（介孔球）可见光光催化剂是通过一种简便的方法合成的。所得的复合材料由许多直径小于 10nm 的 Ag3PO4 纳米粒子组成，这些纳米粒子沉积在 TiO2 纳米粒子表面上形成异质结构。N2 吸附-脱附测量表明，该复合材料具有较高的比表面积，是多孔的。对异质结构的 Ag3PO4/m-TiO2 降解亚甲基蓝（MB）的光催化活性和稳定性的研究表明，与纯 Ag3PO4 和 Ag3PO4/m-TiO2 相比，其可见光光催化性能得到了提高，并且表现出优异的光催化稳定性。性能的提高归因于三个方面：（1）大的比表面积增强了 MB 的吸附；（2）大量的孔增大了光催化剂与 MB 之间的接触面积；（3）最重要的是，将 Ag3PO4 沉积在 TiO2 表面上促进了电子和空穴对的分离，这也提高了光催化性能。此外，还讨论了光催化机理。与 Ag3PO4 相比，Ag3PO4/m-TiO2 中的 Ag 重量百分比从 77%降低到 20.8%，显著降低了光催化剂的成本。
